Mark-Release-Recapture (MRR) of sterile male Aedes albopictus (Skuse) in Sri Lanka: Field performance of sterile males and estimation of the wild mosquito population density

Hapugoda Menaka, Gunawardena Nilmini Silva, Ranathunge Tharaka, Bouyer Jérémy, Maiga Hamidou, Karunathilake Kankanige, Withanage Gayan Parakrama, Weerasinghe Indika, Sow Bazoumana B. D., Harishchandra Jeevanie. 2024. Mark-Release-Recapture (MRR) of sterile male Aedes albopictus (Skuse) in Sri Lanka: Field performance of sterile males and estimation of the wild mosquito population density. Insects, 15 (7), n.spéc. Biology, Ecology and Management of Mosquitoes Affecting Humans and Animals:466, 12 p.

https://doi.org/10.3390/insects15070466

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Résumé : Dengue is an important mosquito-borne disease in Sri Lanka. The Sterile Insect Technique (SIT) is an environment-friendly and novel method that can suppress dengue vector mosquitoes in Sri Lanka. This study aimed to evaluate the field performance of sterile males and the density of wild male Aedes albopictus (Skuse) using a Mark–Release–Recapture (MRR) assay. Laboratory-colonized male pupae were exposed to 50 Gy gamma using a Co60 source. Sterile males (approx. 10,000) marked with fluorescent dust were released weekly for 4 consecutive weeks (January–February 2021) in a geographically isolated 30 ha site in Gampaha. Results show sterile males could disperse up to 543.8 m with a mean distance of 255.1 ± 44.6 m and survive up to 6 days with a mean life expectancy of 3.55 ± 2.32 days. A high field mating competitiveness of sterile males based on a Fried value of 0.47 ± 0.007 and significant induced sterility in the wild eggs in the second generation were found. The mean wild male mosquito population density was 163 males/ha. The data generated will be useful for designing future trials in Sri Lanka and other countries with similar situations.

Mots-clés Agrovoc : Aedes albopictus, vecteur de maladie, lâcher d'insectes stériles, contrôle de maladies, Aedes, lutte anti-insecte, Aedes aegypti, densité de population, infertilité mâle, lutte biologique, stérilisation